Description
Its physical properties are the same as quartz
which is an extreme rarity as the softer material is not often preserved
it exhibits a high water content
Origin: Madagascar
Additional Information: Obsidian is a naturally occurring volcanic rock glass formed by the rapid cooling of viscous lava from volcanoes
Versteinerte Holzscheibe Längsrichtung | Arizona, USA point Its physical properties are theOrigin: Arizona, USA Age: Triassic, 220 million years Size: H57cm W147cm D3cm Weight: 24kg Description: Araucarioxylon arizonicum, cut lengthwise and polished to reveal the spectrum of colors for which the site is famous. The texture on the edges is preserved. Additional information: Petrified wood, fossil formed by the penetration of minerals into the cavities between and within the cells of natural wood, usually silica (silicon dioxide, SiO2) or
Exchange/Return Notes
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